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Molecular cloning and functional characterization of multiple ApOSCs from Andrographis paniculata
Jian Wang1, Hui-Xin Lin2, Huan Zhao3
1School of Traditional Chinese Medicine, Shenyang Pharmaceutical University, Shenyang 100016, China; State Key Laboratory Breeding Base of Dao-di Herbs, National Resource Center for Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing 100700, China; School of Traditional Chinese Medicine, Capital Medical University, Beijing 100069, China.
Researchers identified nine 2,3-oxidosqualene cyclases (OSCs) in Andrographis paniculata, revealing key enzymes involved in triterpenoid biosynthesis. This discovery enhances understanding of compound diversity and the plant
Area of Science:
- Plant biochemistry and molecular biology
- Natural product biosynthesis
- Medicinal plant research
Background:
- Andrographis paniculata is known to produce triterpenoids, including oleanolic acid and β-sitosterol, which have significant biological activities.
- The biosynthetic pathways for triterpenoids in A. paniculata have not been previously elucidated.
- Understanding these pathways is crucial for unlocking the full potential of medicinal plants.
Purpose of the Study:
- To identify and characterize 2,3-oxidosqualene cyclases (OSCs) involved in triterpenoid biosynthesis in Andrographis paniculata.
- To elucidate the specific roles of different OSC enzymes in the formation of key triterpenoid compounds.
- To provide foundational knowledge for the study of triterpenoid diversity in A. paniculata.
Main Methods:
- Isolation and identification of nine 2,3-oxidosqualene cyclases (ApOSC3 to ApOSC11) from A. paniculata.
- Functional characterization of isolated OSCs to determine their enzymatic activities.
- Analysis of the products generated from 2,3-oxidosqualene by specific OSC enzymes.
Main Results:
- ApOSC4 was identified as a monofunctional OSC, specifically converting 2,3-oxidosqualene to β-amyrin.
- ApOSC5 demonstrated bifunctional activity, producing both β-amyrin and α-amyrin from 2,3-oxidosqualene.
- ApOSC6 to ApOSC8 were characterized as multifunctional OSCs, yielding β-amyrin, α-amyrin, and one or two additional unidentified triterpenoids.
Conclusions:
- This study presents the first report on the isolation and function of OSCs in Andrographis paniculata, significantly advancing the understanding of its triterpenoid biosynthetic pathway.
- The discovery of multifunctional OSCs (ApOSC5-ApOSC8) highlights a key mechanism contributing to the rich diversity of triterpenoids found in this medicinal plant.
- These findings lay the groundwork for future research into the regulation and optimization of triterpenoid production in A. paniculata.
